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X-ray

a form of electromagnetic radiation. X-rays have a wavelength in the range of 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3×1016 Hz to 3×1019 Hz) and energies in the range 120 eV to 120 keV. They are shorter in wavelength than UV rays and longer than gamma rays. Hard X-rays can penetrate solid objects, and their most common use is to take images of the inside of objects in diagnostic radiography andcrystallography. As a result, the term X-ray is metonymically used to refer to a radiographic image produced using this method, in addition to the method itself.